Depends on the capacitors used but I personally say the DIYmod line out with BG caps is definately worth it, if you can build it yourself. Darker background, and you get slight warmth, and nice "texture" is added to mids and bass, resulting in great synergy with Arrow. No difference in treble (it's what I feel with BG caps and this may change with other caps). You will need to pay much more for other source gear to achieve better results. Like a CLAS and 6G onwards Classic. And then I don't like iTunes, I want to use my own m3u playlists, plus the extra support for other file formats is useful, so I stick (I'm stuck) with a Rockboxed DIYmod for a few years now.

You can look through my portable gear album to see what I done with mine.

Not sure if it's worth paying so much for RWA and built ones, or paying others to do it. I won't personally pay over $300 including everything - the 5G/5.5G itself, LOD and CF, Tarkan CF adaptor, BG caps, good solder and perhaps new battery and exterior parts).

If you need to pay over that, I suggest thinking about a Fiio X3 as it looks very promising. I haven't compared yet, but the only obvious things other than sound, that an imod should be better is smaller size and Rockbox compatibility.

Honestly, I don't really have an opinion about it. I have a set for my portable rig, but bought them for the protection from dust and wear. They also look quite nice so also for aesthetics. Anything else shouldn't be discussed here.

I must say that the ASG 1.2 are one of the most comfortable IEM's I have ever put into my ears....the fit is amazing and the sound is unbelievable. excellent bass response and amazing mid range (especially vocals). I hate to say this but at the moment I feel that I prefer the ASG1.2 over and above my A.4i.